body {
    font-family: Arial, sans-serif;
    background-color: #f8f8f8;
}
form {
    width: 300px;
    margin: 50px auto;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input, select {
    width: 100%;
    padding: 10px;
    margin: 5px 0;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 5px;
}
input[type="submit"] {
    background-color: #4CAF50;
    color: #fff;
    cursor: pointer;
}
input[type="submit"]:hover {
    background-color: #45a049;
}
input[type="submit"]:hover,
input[type="button"]:hover {
    background-color: #00b3ad;
}
.form-group {
    margin-bottom: 10px;
}
.gender-radio {
    /* 性别单选框不需要100%宽度，不然框与文字不在同一行 */
    width: 35%;
    padding: 10px;
    margin: 5px 0;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 5px;
}